In a very large bowl, cream the butter or margarine with the sugar. Beat in egg yolks three at a time. Stir in pineapple with juice and vanilla. Add flour mixture in 3 parts alternately with fruit juice in 2 parts to the creamed mixture, beginning and ending with flour mixture. Stir in walnuts.

In another bowl, beat egg whites until stiff. Fold egg whites into batter, and stir in fruit gently. Divide batter among pans. Smooth.